避免在类型开关的分支中使用类型断言 [英] Avoid using type assertions in the branches of a type switch

问题描述

我在Go中使用类型开关，例如以下内容:

I use type switches in Go, e.g. the following one:

switch question.(type) {
case interfaces.ComputedQuestion:
    handleComputedQuestion(question.(interfaces.ComputedQuestion), symbols)
case interfaces.InputQuestion:
    handleInputQuestion(question.(interfaces.InputQuestion), symbols)
}

有没有一种方法可以防止在将问题传递给另一个函数之前必须断言案件中的问题类型?

Is there a way to prevent that I have to assert the type of question inside the case before I can pass it to another function?

推荐答案

是的，分配类型切换的结果将为您提供断言的类型

Yes, assigning the result of the type switch will give you the asserted type

switch question := question.(type) {
case interfaces.ComputedQuestion:
    handleComputedQuestion(question, symbols)
case interfaces.InputQuestion:
    handleInputQuestion(question, symbols)
}

http://play.golang.org/p/qy0TPhypvp

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